package c5;

public class E4 {public static void main(String[] args) {
    String s= "itcast";
    System.out.println("将it替换成cn.it的结果:"+s.replace("it","cn.it"));
    String s1=" i t c a s t ";
    System.out.println("去除字符串两端空格后的结果："+s1.trim());
    System.out.println("去除字符串所有空格后的结果："+s1.replace(" "," "));
}
}
